Observation of the degradation due to irradiation of CR 39 polymer by long-term monitoring of mass loss |
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| Institution: | 1. Aix Marseille Université, Institut de Chimie Radicalaire—UMR 7273, Case 551, 13397 Marseille Cedex 20, France;2. Sartorius Stedim FMT S.A.S, Z.I. Les Paluds, Avenue de Jouques CS91051, 13781 Aubagne Cedex, France;3. Aix Marseille Université, LISA, EA4672, Equipe METICA, 13397 Marseille Cedex 20, France;1. Helmholtz Zentrum Berlin (HZB), Institute of Soft Matter and Functional Materials, Hahn-Meitner Platz 1, 14109 Berlin, Germany;2. Helmholtz Zentrum Berlin, Institute of Applied Materials, Hahn-Meitner Platz 1, 14109 Berlin, Germany;3. Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Research Campus Golm, D-14476 Potsdam, Germany;4. Humboldt University of Berlin, Institute of Physics, Unter den Linden 6, 10099 Berlin, Germany;1. National Key Laboratory of Materials Behavior and Evaluation Technology in Space Environment, Harbin Institute of Technology, Harbin 150001, China;2. Research Center of Space Physics and Science, Harbin Institute of Technology, Harbin 150001, China;3. School of Science, Harbin Institute of Technology, Harbin 150001, China;4. Lanzhou Institute of Physics, China Academy of Space Technology, 108 Yanxing Road, Chengguan District, Lanzhou 730000, China;1. Division of Textile Chemistry & Environmental Care, School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China;2. Key Laboratory of Advanced Textile Composite of Ministry of Education, Tianjin Polytechnic University, Tianjin 300387, China |
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| Abstract: | We γ-irradiated CR 39 of three thicknesses with 51–3311 kGy. Mass loss during irradiation repeated the three-step pattern observed by Li et al. Li, S.M., Garreau, H., Vert, M., 1990. Structure-property relationships in the case of the degradation of massive aliphatic poly(α-hydroxy acids) in aqueous media. J. Mater. Sci.: Mater. Med. 1, 123–139.] from thick PLA50. Mass loss following irradiation in thin CR 39 repeated the observations of Grizzi et al. Grizzi, I., Garreau, H., Li, S., Vert, M., 1995. Hydrolytic degradation of devices based on poly(d,l-lactic acid) size-dependence. Biomaterials 16, 305–311.] in thin PLA50, whereas in thicker samples, it followed second-order kinetics. The graph of total mass loss per unit dose against dose absorbed displays the step-wise pattern from ESR spectroscopy Nara, S., Shimada, S., Kashiwabara, H., Sohma, J., 1968. Relation of the decay of free radicals in irradiated polyethylene to the molecular motion of the polymer and the configuration of the free radicals. J. Polym. Sci., Polym. Phys. Ed. 6, 1435–1449.]. The implications for drug release from γ-irradiated microcapsules is discussed. |
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